Determine the best possible position for throttle cable pass-through on firewall. Drilled to 1.078 with step drill and utilized a spherical metal grommet hole size .240. Passed throttle cable through mock up at fuel controller. We'll hold off on final trimming of cable until the other cables are passed through firewall. Re-purposed a Bowden cable clamp 7/32 of an inch by milling center on a lathe .240 inches. The clamp fits perfectly in the mock up and will hold down the cables very nicely.